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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ec8bc9d6709738aae0e191929f50b62da0c92335983eda78222f5cb1e63eb8c' 
  AND token = 'aIClnty0x/eHx0wtrHhYCbcZ2lY2wgwqSevolYsRCPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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