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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d57a9603ce71e13d478896c75800080355efbcafaadb50566d23bfbb90a7205' 
  AND token = '3J5bTPxSJ96pPGdsep03R3z9LFAPkW8dX2xcrdpAcVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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