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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f740122c723aca0a6fbb8f6bc5e2a564fd97a861b35dc691f2bf0ac2cf4f90f' 
  AND token = 'nUJW2PmZiNrOrU3ntNm55f57HlvGOwGUo0MwMY/1axM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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