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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d0cb14d6a594439ea48290bd3c68b05b67efb6b5daaacd60e6591ab2d892534' 
  AND token = 'g44t03h4bZZyIkwq2fOZJDrP1ifeqZP+/ulmbHxRoug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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