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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1e6a2868d52e514d3640b0ca585dbd8a1389be564a04bf788230356b70711ab' 
  AND token = 'wWRA13ySspcc5jnGyyHVZifVqKQMA2vnNQtNLtFVXy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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