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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c687d8c8bd86581c4fbb2eb727ed19c844ca08f9a564cfafaaca00ed9d6f8fae' 
  AND token = 'ypyO8fWivMpYQ+Hvo5kpa7cLS02xTse7VD34y4GZvjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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