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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '784858ae9698de90a9982b91fd908fd5366cbb544cf3c2c66d71622608cf3e7a' 
  AND token = '58rcmrQ490OFKA0oACWC5yxytuAqdwghzoKUNPfCrYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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