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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7699339255b37336237248c6d33655c12a9e8ad467460cdec737404b6a52da9' 
  AND token = 'MO9zGVbqJtpJnPDO86BRkle2rK0KaRMvATExoDnUejg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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