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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11c0ba69921dfbea8138887f94007d4d18adcbfa774bee990852de5b25bb06e4' 
  AND token = 'bdZfg47ruw/x60chqp22vbuoIs3z+717qLVXWpu9d/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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