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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '092e508387fb4e10287a75628ba625b92248544fb625dc0166fbd1ef873a0fb7' 
  AND token = 'ioOZMbbhfFxBthJnNKI34ZNx9KAfqBW+A0eiLroo8hI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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