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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f35f55bd11fe2b388346a95a5be3aa652f4c96e6ff9524d6d38177801899663' 
  AND token = '80P0DW2xJ4rNyW/6ROksjdLTeul8EMHBJDK23Rcz2Uc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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