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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77073ea2f493c5b10095fabe55c4d2e70519e3e4033e3efcfb7b0b063bd093f6' 
  AND token = 'b3dRKgK9tV+0ZVO/TgRC8KvbBpYbWoUx8RFrg+hfqQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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