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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6eb1e2c2d3b544bbf451589c338f104d33c5cea1a75fa58ec9a3dc2376a988a' 
  AND token = '3e3qEZ/yZaTSacA3n8JOicfwivek9U1tfkODtjD9X10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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