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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3aaa1eeada21ba21ba571c7cef5db62f8507ea6ae32890207e22921f4bbed6b9' 
  AND token = 'oUx1e9urCpnEbXcqwQYIXVeWHNRiXngFYAItC6aYI1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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