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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0991c1a135a3753519ae9445cd2ca173803df30d90ea5ec53bb5ff744579e30c' 
  AND token = 'jKDfWJ769y9dg+lp1fEUR8H8TVscZo+INWsNp7qUe64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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