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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad201413a7d7422bed0a02a8f4d82b4b3faa3165fb10000823a88d1f7bd40dc2' 
  AND token = 'w+veboSfBE2NAHqT2CqXHDOpMg7Lly7ayrsoKPRCSg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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