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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b9251c40a7b8b87e44792abe5ff05766c52f17aba1b4299fb1b3b0f5370c8c5' 
  AND token = '8MdMS9sHUZN06F62LmXne0wqBMqQpDZPcM5+rDBm3gg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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