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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8139da745f9f9cb137f682d3e8d673797068812f05af9f9131d395667efa28fd' 
  AND token = 'GDBChf0y5n8IoXEOXhEZJefhg0oIFUB7kaBOM4xQNqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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