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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dde2f8a6d65dd10838a1170e122c568e977a4733cd47523707e93fab08908ba' 
  AND token = 'dvPCr78x3kdqLo6OKfHCLPGbyjo+wCpWCtOY33Sx4LM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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