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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91bbcd0c59151c620ee2099e8563dec92dab12f328626724f205e7f58b436041' 
  AND token = 'YHEpqil2ipjVom4qe0TS3BXTfwDm5iRCSms4tNbobaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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