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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4bc441e05abaa6afe8ab92a11199c1d2626e7c2ccb7e099a6cf7f81e5e79bdc' 
  AND token = 'Z/74v5lGvAhDZLB1dVR1fObrgE5UwxDmsZOcNkBO7jQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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