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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e6549e11f4c917619d76d72dbbe491bfa092466a6964f63e3a1c65fd3daad27' 
  AND token = 's5X4lWKOPp0kKroibha3eDSP31LTuizqfXzV5ohR9nk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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