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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c87e8663ed4698225a5edfaf20a420f5ed1bf13c968474f377388baf6a08b5b2' 
  AND token = 'WnKN1g7b449X7WeW8ffZdMmWtp0VBC49kGX7EpS8IQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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