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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e11a97f6ff85f9f8cb51151bb336b29cb83fff759cfbf4a14b7a1f72fc234430' 
  AND token = 'aq6AL/i+cytixvJJdkwj7r45sLvuD6R0ZFLFqBoXA+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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