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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbe69aa50cae6c196d19977af9f3f2bd259ccfe497cfa668dc25211c4bb97c66' 
  AND token = 'njqHybAbE8ewOTlgQOLr5fibGAY+okwlmj5ic9DVZnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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