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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6de944c5f3ce81b704cff200525a6236304e504df973ea0fd9274f20d0980a70' 
  AND token = 'pWrBYqWRLuuPhCsc6FalTJDb1xaZnyUEqqH52OM5cWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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