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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee0ccb7e71ee81c6fe63d061c3c3c9e63e1d911f16f11d3fa417e55cfa0abb02' 
  AND token = 'p2cb2cxRBHZZ4qRcogDnzFgcvKgWcwNcueiKCozAdcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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