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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7c49191a3dfcb85d6488077da6b9bbcb6823ca4838b8988c294a6e5379a8ff0' 
  AND token = 'Wl0uhELWkAmpqgBZdayaQ3iBxLPl9pb35EXyvLYdkTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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