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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2bd3f2985228bc4a2b4926a7603d3b3fae51f06b00f96a41519242ba29d4c7b' 
  AND token = 'aTzaOrNoMaJB4p+bLaGNS3xqe126tdB1Tn49G2Y64co=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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