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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '764754477ee7b1f406302de804313fd4c8fee28263aaec365f9d3fc36d136501' 
  AND token = 'oDfIFVBllroB/zR37VRIYePi54qf3Q79t09HLqagfLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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