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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecf6339f84ece249bedf5f9cd7caf3f2d81077f7bf85ae4b09c9f22bd2e4eb3b' 
  AND token = 'cz8EiguZ0goDl2ppRgPUaPdtfYpVlvJ6qlyki1xil/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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