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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a662fddfb58f38d46a45a9e731b47b9bd008e40d3f3f852ed7ae90fb3ae25cfe' 
  AND token = 'zys22Qkxn0tyDzk5JATl3WV9/1TbyFpfa9oAJaRcfbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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