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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e870056bf67cf028cb67ab84e8d896c5609b8d524d3a06a79ce3b6534a5244d7' 
  AND token = 'h1y/ETOxrSoQulB7d2R6mnCkfKa1BIimTxlvH1q8SGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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