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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07bfc8f6279cf0fa2568b14601dcadb28356a6dc96b81096250cb61705e041b5' 
  AND token = '7O5fhNcPCzphR2r+MnW/Y0r0K7pVaVovvs3utC5bEhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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