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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c56c8b162e9096bd5846f103031ebea24288fbf3fed1774d1c419f77eaf90c7' 
  AND token = 'Ti/htO6AQ07zrQUBAxWkOScsrBmJB6lk6BcHgvdtg0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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