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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1ab9bc1190cc2de10b29f6247715bf21bf66d7db11d7cc20dcaca9d429b884b' 
  AND token = 'y8mB2rBYVKCjxATOttS4CFdXWgyKG81WfoyZD0dFyHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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