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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6cdac9f7c586b09ccdf0d4c9029c1921ff9f08583bedd93d0faa3f8da2cd790' 
  AND token = 'ZPuzqHtmT9cHUoUeWrsGdP0c7PUOj952YV0CHkXnREk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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