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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b45374b346f95d2209e4fbf8c112f4633f8ca26e7e10ab6f7a358e9cd2ff671' 
  AND token = 's7T66+YCsrrZPcW/dIGaucZzX+I/PgqD3VaWL/ey7ko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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