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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c257dc626caabfe0d717888321c64d14e340330e18a96f0d98df66172922fc4a' 
  AND token = 'IC1nw/tmcuclNrhFZywakHBts3zAsDdOus0U9qcdxLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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