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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8a90d6eb2614f384e761a7d277b06bc78365221a70f1c604b13159419ed2072' 
  AND token = 'ydDpsSMeR3gmLDg4gaIfwH87CY8/oARSKUZzgD3wIRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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