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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1ef4cd9ce5e0f3f577f5e7116e2397969c02e83efc0536ca7731e8a421c7fa1' 
  AND token = 'EEhzh3uLsyWMCg4uPFsQyXWZYKzunXrhhmOUKNip1To=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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