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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d9431569c318bdd2ee5b039de1619746a7bbc774b6b6225a5d5094ef689d794' 
  AND token = 'XfHrHW5ooV38EsKNpD0fzuhQ9WMC9mb8TPHvgccgopo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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