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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bba500b0d3806b24b9261663c7d318a62dcb091f4e307a111a95d377ee26ec7' 
  AND token = 'mRfyz84Dc/XyiB2+p+Qq9Ho6YMWJRD7hVopdSkPYupU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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