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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bfdb2b0f522c8d04e9765f05bf422b1e9b9c8e994c78f18b1514c64c0926c7f' 
  AND token = 'OjhWQZI6cAv+/hJQ8TZxLdxRdkcPM3iC9ml5lTMCW/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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