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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3ddfe79498b0a56332b411fdebf94435692f5ee9c808fcbc3e58e4963f9d29a' 
  AND token = 'XdvRTpHXNYl1uigvJs63HiKX3JN2rHOuqF1+ajeOZa8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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