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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efdbdb54234706a043bec8ca2c610546005cb7af5d98896d344e4e5a5d9caa4e' 
  AND token = 'I+KpLcY5CIZcGkjWWRUO/ZcDUKH2QMPlzf6wLBAI96E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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