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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02e91deeb307e3e591a94f0a95e7df4aff68ca6ec95bbe5ce163df7cab234c20' 
  AND token = 'PVxMEh4SivEWwKIrfJWghJ2C54En29Og3MJkxKf98vU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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