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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a01487e9048d2689e8eb08eba3fef63da6dc16a8c60c584e7aedf08a07c964c' 
  AND token = '3KjOTXqa0h0lZiqxBsem+7ojMkeBw8ChfI/HPvRBQWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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