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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd582c4289135c355fc6ec45bc581791532cff00c42cdc493493bf1f201c0a0a' 
  AND token = '0yp4eqk7eGV5nolqIiHZLeFAxhk3U8FBTys/2tMTBAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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