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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca94bb59f7b54b6ab92959e4e59b6689ea19da0ad517976034be5c7e82363236' 
  AND token = 'fTU0uP+fCiCeYH5hBPnk5cbELvNT9a044707WA37WkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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