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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '108bff75883cb3d1d4ee9a917e52d1df3a6ee83bc6f744724f5ca072ada790c6' 
  AND token = 'HNMIJLOgOF8my1MruQjAQWsR/J26F8+1B9CCcK2t+14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}