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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb16c48db6f99edc882cbce4b07fcb53c9410934688ca54af1ef72d37cd0c7a9' 
  AND token = '34pFPMy/5Ggted/AsNdubWjsiNccAdWs5k79b03nJFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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