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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26bd80f0a9a8f13150adef75ac7ba6a5c5908b8086e5df91593f15653ad7a572' 
  AND token = 'dZZ10614GA4ovidQyp2EcOwyz23fM1iK8a+KfroPco8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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