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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ca0037adcf02bfe277866970f5d003b3d60cc4c6c1a138ecaba9d562c3f7665' 
  AND token = '3NWfYeoL39b3gdcE700zmSW4G81joMCTcOMwkh7kbmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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