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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4b432503cc2477aae5db8b848c72921e627b3620cc6831c969b4797c1db7e8c' 
  AND token = '0d97rf7/ACrQsMvkbzqu0iWZEgJ7D6pRs+9AQ8LbEik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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