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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c685ba2514379ecd278c20e3af010202d876761dd73a38fb306e967b4a524b77' 
  AND token = '1urVy3/JCM0emWM7PdIpHhsl+B4I4YZgg5aItohfJpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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