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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e264a42276d390a5ca23085c4a1a5403f21a9b472b7e78d1d899f79c5d8907f1' 
  AND token = 'SP95EGDp1X9fRXYpnSWu+78mH0oTZkvUinudnEb5MMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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