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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0133b2d23bef5e3fb30c6efe8e22db97e59cfecadb9844e8601e0c9fb57c219a' 
  AND token = '8cK1CWWS0ZFM6pWnKP+gLRN+PNonbW+lUBBkunwG4OM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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