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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c6eb1d4905070595e14a933c3ff37b03b831253018888ff8737f2a63b17b087' 
  AND token = 'FajZp74cwDBhR4lO3dcJF4o5Pl/asob1H/3lVocnSpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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