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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca8f156af02f28741afa2bc073357cd2c718bc733e98f54075906823e5cc756a' 
  AND token = 'mt2GxloOu3EHxwmjHGd4HKiI//gK7fUCWbL9Ni9pvSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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