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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9904f60edfc1300978e59d2c427370fb09f0b094187da5941e9a827f876849d1' 
  AND token = 'CDoDM0pJw8d0vACaoLJ9LSXg8+xJ70G3mu5Wqi1NuQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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