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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af4e312443bf6a61c34b1a347dd57fde488c7bcbe936a1a64de1c5a6c4b6034c' 
  AND token = 'QROggyJOo2FbDyPj68Fz+Wex2R2PEjbzSWVVjtOgOZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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