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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dbaf834cc8de003b13caa2554973b8d3f294cc86d2ba0faef792bfe816a3576' 
  AND token = 'Vd3QFIBj2al1x2MpOJMa/3YUklQ7xjqSjc3pfp+yiQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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