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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '292ba9f7b21b22903154b2101ac0f4aa8b2f7b051d93989a86c15fb30d99dc57' 
  AND token = '0MmQRFLC64M4FJgfz4IQ2kW+tRqlVuRdogV3v12Urw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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