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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '824c53996d31125de4b62dd7f81fa3e81bcd420511bef52800bd1a72df352a4a' 
  AND token = 'K75sawpkOKaJkWnVAhC0h29ShVxEGwLT7XqGGc4aVao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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