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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '321f0f72f7438ef520959e0dc790d170cb864f0eaceee88925d035acd7385ec2' 
  AND token = 'dQb/kAIQAs5rcACTyrPCCrZsDn0ekJDkwFfeIYrkH1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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